如何在Windows窗体中调用类函数？ [英] How to call class function in Windows Forms ?

问题描述

如果班级有功能

if class have function

public void dbConnection(string ProjectName112)
{
  string strProject = ProjectName112; //Enter your SQL server instance name
}

推荐答案

对于您显示的方法，为了调用它，您需要一个包含类的实例：该方法所属的类的示例，使用 new 关键字在某些时候创建：

In the case of the method you show, in order to call it you need an instance of the containing class: an example of the class that the method is part of, created at some point with the new keyword:

MyClass mc = new MyClass();
...
mc.dbConnection();

如果将其更改为 static 方法：

If you change it to a static method:

public static void dbConnection(string ProjectName112)
{
  string strProject = ProjectName112; //Enter your SQL server instance name
}

然后你不需要实例，你可以只使用类名：

Then you don;t need the instance, you can just use the class name:

MyClass.dbConnection();

但是方法可以' t访问MyClass类的任何非静态字段，属性或方法。



但是......你展示的例子没有任何用处：它没有返回值，并且当方法退出时，字符串变量 strProject 被销毁，因此nothign将影响外部世界。



我认为你需要仔细考虑一下你在这里想要达到的目标：这可能不会起作用......

But then the method can't access any non-static field, properties or methods of the MyClass class.

But...the example you show does nothing useful: it returns no value, and the string variable strProject is destroyed when the method exits, so nothign will influence the outside world.

I think you need to think a bit about exactly what you are trying to achieve here: this probably isn't going to work...

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